Electbic bbake



- end through which extends a pin 6 u on Reissued Nov. 9 1926.

UNITED STATES PATENT ol-"r ce.

R -iw CHARLES N. ALTEB AND ERNEST SMITH, 0F ALLIANCE, OHIO.

anacrmc BRAKE.

1 Driginal No. 1,591,692. dated The present invention relates to brakes,and more particularly to electrically operated brakes such asare-employed on bridgehoists and similar apparatus.

The object of the invention is to provide an eflicient brake of this tpe which is normally spring-applied an adapted to be moved to releasedposition by a relatively small amount of applied power.

7 The invention is illustrated in the accompanying drawings, wherein--Figs. 1 and 2 are respectivelyaplan view and a side elevation of a brakeembodying a preferred form of our invention; Fig. 3 is an end elevationof the brake looking from the left; Fig. 4 is a sec'tionon the lineIV-IV of Fig; 2; Fig. 5 is a'detail sectional view of certain of-theparts of the brake assembly; Figs. 6 and 7 are respectively detailsectional views on the' lines VIVI and VIIVII of Fig. 2; and Fig.

I 8 is a detail view showing a slight modifi- 1 ver.

cation. y I

Referr ng to Figs. 1 to 7, inclusive, 2

designates a brake drum. Beneath the drum is a base casting 3 havingholes 4 at its op; posite ends whereby it is adapted to be secured to asuitable support'by. bolts or screws.

The base 3 has ears 5 adjacent its rear which is journaled a bell-cranklever 7 he shorter horizontal arm of the bell-crank lever 7 has ascrew-threaded in 8 extending through an opening therein. This pin isthreaded into an opening 9 in the base 3 and hasa nut 10 mounted on itsupper end. A spring 11 surrounds the pin 8 be tween the nut 10 and theupper surface of the horizontal arm of the bell-crank le- The verticalarm of the bell-crank lever has. a forked upper extremity and -a. pivotpin 12 extends through the branches 7 thereof. J ournaled upon the pin12 are clips 13 and 14 secured to the ends of brake band elements 15 and16.

The base 3 has an integral vertical arm- 17 at its forward end. This armhas a bifurcated or forked upper extremity and through the branches 17thereof extend upper and lower pivot pins 18 and 19 uponwhich arejournaled inter-meshing gear segments 20 and' 21. An inverted U-shapedJuly 8, 1926, Serial No. 20,357; filed April'S, 1 925. Application forreissue filed August 11, 1926. Serial No. 128,716.

member 22 is journaled at its lower end upon a pin 23 which extendsthrou h an opening in the gear segment 21. -S idin between the verticalarms of the U-shape member 22 is another inverted U-shaped member 24,the vertical arms of which are journaled upon a pin 25 extendin anopeningin the bifurcated end 0% the gear segment 20. This pin extendsthrough slots 26 in the arms of the U-shaped member 22. J ournaled uponthe pins 23 and 25 are cli s' 27 and 28 attached to theends of the bra eband elements 15 and 16. A pin 29 extends.

through an opening in the-head of the U- shapedmember 24 and has ascrew-threaded head 30 which is screwed into the head of the U-shapedmember 22. This pin is surrounded by a coil spring 31, the ends of whichbear against the upper surface of the head of the U-sha'ped member 24:and the under surface'of the head of the U-shaped member 22. The pin 29has a wrench engaging portion 32 above its screw-threaded head wherebythe pin can be screwed in or out of the head of the U-shaped member 22to increase or decrease the tension of the spring 31.

It will be apparent that the spring 31 exthrough erts its tension totend to. move'the'pivot pins 23 and 25 towards each other and therebymaintain the brake normally applied. The bell-crank lever 7 vaflfords a.'ielding pivotal support for each of the bra e band elements and tendsto equalize the applied pressure.

In Figs. 1 and 2 we have shown one form of electrical means forreleasing the brake. Refer-ring to these figures, 33 represents asolenoid housing having a coil'34 therein and an armature 35 pivoted atits upper end. The lower end 0 the armature'is connected by a linlt 36to the lower end of a, bell-crank operating member 37. The horizontalarm of thi i bell-crank lever is bifurcated and the brapches thereofpivoted upon the ends of the pm 18.- The vertical arm of the bell-crankleter has a yoke portion 37 into the opening iii whichextend the ends 38I and 39 of the gea rsegments-2O and 21. The

end-38 is boltedto the under surface of the head ofthe yoke portion 37by a bolt 37".

The link 36 i adjustablein length by means of a turn-bupkle 40. It willbe apparent and havir that when the coil 34 is energized and thearmature attracted, the gear segments 20 and 2.1 will le rotated ontheir pivots 18 and l9 in a direction to move the pins 23 and 25 awayfrom each other and thus re lease the brake.

In Fig. 8 we have shown a slightly modified form of electrical brakereleasing means. In this modificationthe plunger d1 of a solenoid e2bears against the under surface of anoperating This arm is bolted to theend 59 of the gear segment 21 by means of a bolt 4:4. It will be seenthat when the solenoid coil is energized to cause the plunger 41 to moveupwardly, the gear segments 20 and 21 will be rotated in a direction torelease the'brake.

While we have shown and described certain prei erred embodiments ofour-invention, it will be understood that the invention is not limitedto its illustrated embodiments, but that it may be otherwise embodied'within the scope of the appended claims without departing from thespirit of the invention;

' "We claim:

1. A brake, omprising a brake band, a pair of pivoted mtermeshing gearsegments connected to the ends of said brakeband, a spring meansoperatively connecting the said gear segments and tending to rotate themin "one direction, and means operatively con-- nected to one of saidsegments for rotating them. in the opposite direction.

2. A brake, comprising a brake band, a pair of pivoted intermeshing gearsegments connected to the ends of. said brake band,

spring means operatively connecting the said K g segments and tending toPalate e in of said elements for moving them 'into and out of engagementwith said drum, and a a direction to apply brake, and means 'operativelyconnected to one of said segments for rotating them in a direction torelease the brake.

i A brake, comprising a brake band, a pair of pivoted intermeshing gearsegments connected to the ends of said brake band, spring meansoperatively connecting the two said gear segments and tending to rotatethem in redirection to apply the brake, and electrical means operativelyconnected to one of nents for rotating them in a direction to releasethe brake.

i. A brake, comprising a brake band, a base, a bell-crank lever pivotedto said base one arm thereof pivotall connected to id h band, a r ringacting on the other arm of said lever ind tending 'ngr "'ie first arm ina direction to apply ion to the brain, band, a pair inter-- meshing gearscgments pivoted said base :ind pivolally connected to the of saidshrine means era -ly cons zinc tending;

one of said gear segments for rotating said segments in the oppositedirection to release the brake.

arm integral with the other end of said base and having apair ofintermeshing gear segments pivoted thereon, said segments being pivotedto the other ends of said brake band elements, an inverted U-shapedmember pivoted at its lower end to one of said.- gear segments, aninverted U-shaped member sliding in the first U-shaped member andconnected to the other gear segment, a spring acting on. both of saidU-shaped members and tending to move them in a direction to apply thebrake, and means operatively connected to one of said gear segments forrotating them in a direction to release the brake.

6. In brake mechanism, the combination of a two element brake band.having said elements pivotally connected together at one end, a pivotalresilient support for said pivoted ends of said brake elements, andmeans for actuating the free ends of said elements in both braking andreleasing directions.

.7. In brake mechanism, the combination of a brake drum, a two elementbrake band for said drum, said brake elements being pivotally mountedtogether at one end, actuating mechanism connected to the other endspivotal support for the pivotally connected ends of said elements andresilient means normally tending to move said pivotal support away fromsaid drum.

8. In brake mechanism, the combinationv of a brake drum, 'a two elementbrake band for said drum, said brake elements being pivotally mountedtogether at one end, actuating mechanism connected to the othet ends ofsaid elements for moving them into and out ofengagement with said drum,a pivotal support for the pivotally connected ends of said elements andresilient means normally tending to move said pivotal support away fromsaid drum, and means for limiting the movement of said pivotal supportto a predetermined distance.

9. In brake mechanism, the combination of a brake drum, a two elementbrake band for said drum, said brake elements being pivotally mounted.together at one end, actnat- Eng mechanism connected to the other endsof said elements for moving them into and out of engagement with saiddrum, a pivotal sup-nor: for the pivotally connected ends 01" saidelements and resilient'means normally tending to move said pivotalsupportlaway from said-drum, and means for adjusting the resilient meansto vary' the tension thereof.

10. In brake mechanism, the combination of a brakedrum, a two elementbrake band for said drum, said'brake elements being pivotally mountedtogether at one end, actuating mechanism connected to the other ends ofsaid elements for moving them into and-out of enga ement withSILld'dllllIl, a pivotal support orethe pivotall connected ends of saidelements and resilient means normally tending to move said pivotalsupport away irom said drum, means for limiting the movement of saidpivotal support to a predetermined distance, and means for adjustinthe-resilient meansito vary the tension t ereof.

'11. In. brake mechanism, the combination of. a brakedrum, twosemicircular brake band elements pivotally connected together,

brake actuatingmechanism attached to the. free ends oi said elements andadapted to move said elements in both brake applying and releasingdirections, a pivotally mounted support for the ivotal -connect-ion ofsaid elements, andfresi ient (means connected to said support and rmallyadapted to move the same and said brake elements away from I said drum.

12. In brake mechanism, the combination of a brake .drun), twosemicircular brake band elements pivotally connected together,

brake actuating mechanism attached to the free ends of said elements andadapted to move said elements in both brake applying and releasingdirections, a pivotally mounted support for the ivotal connection'ofsaid elements, and resi ient means connected to said support andnormally adapted to move the same and said brake elements away from saiddrum, the connection between said support and said elements beingsubstantially diametrically opposite the free ends of said elements.

Signed by us this 9th day of Aug, 1926. p CHARLES. N. ALTER.

' ERNEST SMITH.

